For a non official raid (Just for fun) No high rank needs to be in game, nobody can be kicked unless seriously rule offending and there is no way of winning.
For an official raid, you must get 100 KO's to win, the leader of both groups must be in the game with atleast six troops.
Group: http://www.roblox.com/My/Groups.aspx?gid=1067665
This game was made 60% by SirEdwardAubrey and 40% by Sildow
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City of New York, 1776
Intro might take a while... Other then that, enjoy!